void drawColorWheel( QPainter *p )
{
QFont f( "times", 18, QFont::Bold );
p->setFont( f );
p->setPen( Qt::black );
p->setWindow( 0, 0, 500, 500 ); // defines coordinate system
for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles
QWMatrix matrix;
matrix.translate( 250.0F, 250.0F ); // move to center
matrix.shear( 0.0F, 0.3F ); // twist it
matrix.rotate( (float)i*10 ); // rotate 0,10,20,.. degrees
p->setWorldMatrix( matrix ); // use this world matrix
QColor c;
c.setHsv( i*10, 255, 255 ); // rainbow effect
p->setBrush( c ); // solid fill with color c
p->drawRect( 70, -10, 80, 10 ); // draw the rectangle
QString n;
n.sprintf( "H=%d", i*10 );
p->drawText( 80+70+5, 0, n ); // draw the hue number
}
}
void KoChild::updateMatrix()
{
QWMatrix r;
r.rotate( - d->m_rotation );
QPoint p = r.map( QPoint( d->m_rotationPoint.x(),
d->m_rotationPoint.y() ) );
QWMatrix m;
m.rotate( d->m_rotation );
m.translate( -d->m_rotationPoint.x() + d->m_geometry.x(), -d->m_rotationPoint.y() + d->m_geometry.y() );
m.translate( p.x(), p.y() );
m.shear( d->m_shearX, d->m_shearY );
d->m_matrix = m;
}